Buick 2001 LeSabre Owner's Manual page 117

Mirror Operation
To turn on the automatic dimming feature, press
MIRROR (or press and hold the on/off button for
about three seconds for mirrors equipped with OnStar
controls). To turn off automatic dimming, press
MIRROR (or press and hold the on/off button for
about three seconds for mirrors equipped with OnStar
controls) again. The green indicator light will be
illuminated when this feature is active. The automatic
dimming feature will be active each time the vehicle
is started.
Compass Operation
Press COMPASS (or the on/off button for mirrors
equipped with OnStar controls) once to turn the compass
on or off.
When the ignition and the compass feature are on, the
compass will show two character boxes for approximately
two seconds. After two seconds, the mirror will display the
compass heading.
2-52
Compass Calibration
If, after two seconds, the display does not show a
compass heading ("N" for North, for example),
there may be a strong magnetic field interfering with
the compass. Such interference may be caused by a
magnetic antenna mount, magnetic note pad holder
or a similar magnetic item. If the letter "C" should
ever appear in the compass window, the compass may
need calibration.
The mirror can be calibrated in one of two ways:
D
Drive the vehicle in circles at 5 mph (8 km/h) or less
until the display reads a direction, or
D
drive the vehicle on your everyday routine.
Mirrors equipped with OnStar controls can be placed in
calibration mode by pressing and holding the on/off
button until a "C" is shown in the compass display.